Question

我正在尝试编写一个JSP，以使用扫描仪读取文件并替换字符串。以下是我正在尝试的。我可以使用扫描仪找到字符串，但不会将其写入文件。该文件始终为空。我想递归地搜索文件夹中的文件并替换匹配的字符串。感谢您的帮助。

<%      

            out.println("File Details <br>");

                String resp = single("C:/Users/path");
                out.println(resp);


        %>
        <%!

                public static ArrayList<String> fileList = new ArrayList<String>();
                public static String single(String URL) {
                    System.out.println(URL);
                String respStr="";
                fileList.clear();
                java.io.File file;

                java.io.File dir = new java.io.File(URL);
                String[] list = dir.list();


                for (String filepath :  readDirectoryContents(dir,fileList)) {

                    try {   
                        Path path = Paths.get(filepath);
                        Charset charset = StandardCharsets.UTF_8;

                        String content = new String(Files.readAllBytes(path), charset);
                        String searchStr = "searchtext";
                        Scanner scan = new Scanner(new File(filepath));
                        PrintWriter writer = new PrintWriter(filepath, "UTF-8");
                        while(scan.hasNext()){

                            String line = scan.nextLine().toLowerCase().toString();

                            if(line.contains(searchStr)){

                                content = content.replaceAll("searchtext", "replacetext");


                                respStr += filepath;
                                writer.println(line);
                                writer.printf("pi is %.3f\n", 3.1415926);
                            }


                        }

                        writer.close();
                    }
                    catch (Exception e) { 
                         respStr += filepath;
                         continue;
                    }

                }
                return respStr;

        }

        public static ArrayList<String> readDirectoryContents(File dir,ArrayList<String> fileList) {
            try {
                File[] files = dir.listFiles();
                for (File file : files) {
                    if (file.isDirectory()) {
                        readDirectoryContents(file,fileList);
                    } else {                            
                        fileList.add(file.getCanonicalPath());
                    }
                }                   
            } catch (IOException ioe) {
                ioe.printStackTrace();
            }
            return fileList;
        }



%>

Answer 1

希望这就是您要寻找的

<%      

        out.println("File Details <br>");

            String resp = single("C:/Users/path");
            out.println(resp);


    %>
    <%!

            public static ArrayList<String> fileList = new ArrayList<String>();
            public static String single(String URL) {
                System.out.println(URL);
            String respStr="";
            fileList.clear();
            java.io.File file;

            java.io.File dir = new java.io.File(URL);
            String[] list = dir.list();


            for (String filepath :  readDirectoryContents(dir,fileList)) {

                try {   
                    Path path = Paths.get(filepath);
                    Charset charset = StandardCharsets.UTF_8;

                    String content = new String(Files.readAllBytes(path), charset);
                    String searchStr = "searchtext";
                    Scanner scan = new Scanner(new File(filepath));
                    PrintWriter writer = new PrintWriter(filepath, "UTF-8");

                        if(content.contains(searchStr)){

                            content = content.replaceAll("searchtext","replacetext");


                            respStr += filepath;

                           // writer.printf("pi is %.3f\n", 3.1415926);
                        }


                    writer.println(content);

                    writer.close();
                }
                catch (Exception e) { 
                     respStr += filepath;
                     continue;
                }

            }
            return respStr;

    }

    public static ArrayList<String> readDirectoryContents(File dir,ArrayList<String> fileList) {
        try {
            File[] files = dir.listFiles();
            for (File file : files) {
                if (file.isDirectory()) {
                    readDirectoryContents(file,fileList);
                } else {                            
                    fileList.add(file.getCanonicalPath());
                }
            }                   
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
        return fileList;
    }
%>

使用Java扫描仪和Printwriter查找并替换几个文本文件中的单词

1 个答案: